CN113339512B

CN113339512B - Solenoid valve and have its sphygmomanometer

Info

Publication number: CN113339512B
Application number: CN202110561237.7A
Authority: CN
Inventors: 江沛杰; 李辉; 赵仲康
Original assignee: Shenzhen Sangtaida Technology Co ltd
Current assignee: Shenzhen Sangtaida Technology Co ltd
Priority date: 2021-05-22
Filing date: 2021-05-22
Publication date: 2022-08-02
Anticipated expiration: 2041-05-22
Also published as: CN113339512A

Abstract

The electromagnetic valve comprises a shell, a framework and a coil, wherein the shell is provided with a gas passing cavity, an inner hole communicated with the gas passing cavity is formed in the framework, an inner core for opening and closing an opening of the gas passing cavity and a reset elastic piece for driving the inner core to reset are arranged in the inner hole and pushed by the electromagnetic force of the coil, and a sealing piece for sealing and matching with the opening of the gas passing cavity is arranged on the inner core; a first air passing gap is formed between the inner core and the inner wall of the inner hole, and a first exhaust cavity and a second exhaust cavity for exhausting air simultaneously are arranged on the framework. The arrangement of the first exhaust cavity and the second exhaust cavity enables the air in the inner hole to flow to have two air paths. In the gas storage spare enters into the hole through crossing the gas chamber, partly gaseous from first gas circuit discharge, another part is gaseous from the second gas circuit discharge, from this for the solenoid valve of this application can be through reducing the gas flow rate on every gas circuit, thereby realizes noise reduction's production.

Description

Solenoid valve and have its sphygmomanometer

Technical Field

The application relates to the technical field of valves, in particular to an electromagnetic valve and a sphygmomanometer with the same.

Background

The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling gas circulation, and belongs to an actuator. The electromagnetic valve is often used for matching with a gas storage piece needing pressure maintaining, such as a gas bag of a sphygmomanometer and the like.

The patent that refers to the grant publication number is CN212960115U discloses a novel normally open solenoid valve, and still the solenoid valve includes fixed lid, plastic skeleton and U type iron, the plastic skeleton upper end cover is established on the through-hole in the middle of the fixed lid, and the bottom at U type iron is installed to the lower extreme, the inside pentagonal hole that is equipped with of plastic skeleton, the cover is equipped with magnetic pole, rubber gasket, spring and rivet in proper order in the pentagonal hole. When the gas storage piece stores gas, the electromagnetic valve is electrified to be in a closed state, so that the gas in the gas storage piece is stable and does not leak. When the gas storage part is deflated, the electromagnetic valve is powered off to be in an open state, and at the moment, the gas in the gas storage part can leave the gas storage part through the electromagnetic valve.

To the correlation technique among the above-mentioned, at the in-process of actual control gas circulation, gas can enter into the pentagonal hole of plastic skeleton from the rivet, then passes the clearance between magnetic pole and the pentagonal hole, leaves the solenoid valve from the opening that the pentagonal hole kept away from rivet one end at last. Because the clearance between magnetic pole and the pentagon hole is little so that the velocity of flow of gas is big, so that the solenoid valve easily produces great noise at the process of disappointing.

Disclosure of Invention

In order to reduce the noise, the invention aims to provide an electromagnetic valve and a sphygmomanometer with the same.

In a first aspect, the present application provides an electromagnetic valve and a sphygmomanometer with the same, which adopts the following technical scheme:

a solenoid valve comprises a shell, a framework arranged in the shell and a coil arranged on the framework, wherein the shell is provided with a through air cavity for air circulation, an inner hole communicated with the through air cavity is formed in the framework, an inner core for opening and closing an opening of the through air cavity and a reset elastic piece for driving the inner core to reset are arranged in the inner hole and pushed by electromagnetic force of the coil, and a sealing piece for sealing and matching with the opening of the through air cavity is arranged on the inner core;

the inner core with be formed with first air gap of crossing between the hole inner wall, be provided with the first exhaust chamber and the second exhaust chamber that gas simultaneously discharged on the skeleton, first exhaust chamber is formed in the inner hole the inner core is kept away from cross one side of air chamber, the second exhaust chamber is located the hole is kept away from on the opening terminal surface of first exhaust chamber one end.

Through adopting above-mentioned technical scheme, when losing air, the gas in the gas storage spare enters into the hole through crossing the gas chamber in, and then some gas passes first gas clearance in order to discharge to the external world from first exhaust intracavity, and the gas of another part is then discharged to the external world from second exhaust chamber.

The arrangement of the first exhaust cavity and the second exhaust cavity enables the air in the inner hole to flow through two air paths, and the two air paths are defined as a first air path connected with the first exhaust cavity and a second air path connected with the second exhaust cavity. In the gas storage spare enters into the hole via crossing the air cavity, partly gaseous discharges from first gas circuit to make the downthehole gas circuit of traditional single solenoid valve become two the way all the way, thereby reduce the circulation of gaseous unit interval in the single gas circuit, from this, make the solenoid valve of this application can be through reducing the gas flow rate on every gas circuit, thereby realize the production of noise reduction.

Optionally, the second exhaust chamber includes the buffering portion that encircles the hole sets up and with the water conservancy diversion portion of buffering portion intercommunication, the water conservancy diversion portion is located the buffering portion is kept away from one side of hole.

Through adopting above-mentioned technical scheme, the air current in the hole gets into buffer portion earlier in order to weaken the velocity of flow of gas, and then gas is discharged to the external world from the water conservancy diversion portion again to further weaken the noise that the air current produced at the second exhaust chamber.

Optionally, the shell is provided with the piece of breathing in, the chamber of breathing in the piece of breathing in, the piece of breathing in has the inlet end and gives vent to anger the end, the inlet end is located outside the shell, the end of giving vent to anger is located in the hole of skeleton and is located first exhaust chamber with between the second exhaust chamber, the piece of breathing in with be formed with the second between the inner wall of hole and cross the gas clearance, the second cross the gas clearance with second exhaust chamber intercommunication.

By adopting the technical scheme, the size of the first air passing gap is matched with the size of the second air passing gap so that the air flow in the first air path and the air flow in the second air path are kept balanced, and the condition that the air flow of one air path is far larger than that of the other air path is reduced.

Optionally, an exhaust guide groove is formed in the end face of the air outlet end of the air passing piece, the exhaust guide groove is located in the framework, and the exhaust guide groove is communicated with the second exhaust cavity.

Through adopting above-mentioned technical scheme, the guiding gutter that exhausts is used for crossing the gas flow area of gas clearance fit in order to increase the second gas circuit with the second to reduce the velocity of flow of gas on the second gas circuit, from this, further reduce the air current noise that this application solenoid valve produced on the second gas circuit.

Optionally, the outer edge surface of the inner core near one end of the air passing cavity is provided with a positioning groove in a surrounding manner, the reset elastic element comprises a reset section and a stabilizing section, the reset section is mainly used for providing reset thrust for the inner core, the stabilizing section is mainly used for reducing collision of the inner core on the inner wall of the inner hole, the reset section is located at one end, close to the air passing cavity, of the stabilizing section, and the positioning groove is sleeved with the stabilizing section.

Through adopting above-mentioned technical scheme, the constant head tank is located in order to reduce the area of contact when colliding between inner core and the hole inner wall to the stable section cover of the elastic component that resets to reduce the striking noise between inner core and the hole, from this, make this application can further noise reduction.

Optionally, the length of the positioning groove along the axial direction of the inner core is greater than half of the length of the positioning groove along the axial direction of the inner core.

By adopting the technical scheme, when the length of the stabilizing section is more than half of the length of the inner core, the collision between the outer wall of the inner core and the inner wall of the inner hole is basically replaced by the outer edge surface of the reset elastic piece, so that the collision noise on the inner wall of the inner hole is further reduced.

Optionally, the inner core has set gradually sealed hole, connecting hole and mounting hole along keeping away from cross the air cavity direction, the sealing member includes be used for sealing cross the open-ended sealing of air cavity, be used for restricting the sealing member breaks away from the anticreep portion of inner core and be used for connecting the connecting portion of sealing portion and anticreep portion, the sealing portion install in sealed hole, connecting portion are located in the connecting hole, anticreep portion install in the mounting hole is close to the pore wall of connecting hole one side.

Through adopting above-mentioned technical scheme, sealing portion and anticreep portion are connected to connecting portion, and anticreep portion cooperates with connecting portion in order to provide the sealing portion pulling force to restriction sealing portion breaks away from sealed hole from the one end that the inner core was close to the air cavity, and simultaneously, sealing portion cooperates with connecting portion in order to provide anticreep portion pulling force, thereby restriction anticreep portion breaks away from the mounting hole diapire from the one end that the air cavity was kept away from to the inner core, thereby makes the sealing member can install on the inner core steadily. Compare in traditional sealing member and need paste the fixed mode on the inner core through glue, the sealing member installation of this application is stable environmental protection more, and connects equally reliably.

Optionally, the sealing element further comprises a separation part capable of breaking away from the retaining part under tension, and the separation part is separated from the retaining part after the sealing element is mounted on the inner core.

By adopting the technical scheme, when the sealing element is installed, the separating part sequentially penetrates through the sealing hole, the connecting hole and the installing hole, so that the end part of the separating part penetrates out from one end, far away from the sealing hole, of the installing hole, at the moment, the separating part is exerted with pulling force, so that the anti-falling part penetrates through the connecting hole and enters the installing hole, the sealing part is stably installed in the sealing hole, at the moment, the separating part is continuously exerted with pulling force to break the connecting part between the separating part and the anti-falling part, and therefore the separation between the separating part and the anti-falling part is completed, and therefore the sealing element is installed more conveniently.

Optionally, an easy-to-break groove is formed at the joint of the anti-falling part and the separating part.

Through adopting above-mentioned technical scheme, the separation between anticreep portion and the separation part is more simple and convenient for the setting up of easy-to-tear groove to further improve the convenience of sealing member installation.

In a second aspect, the electromagnetic valve and the sphygmomanometer with the same adopt the following technical scheme:

a sphygmomanometer comprises the electromagnetic valve.

Through adopting above-mentioned technical scheme, the noise of the production of solenoid valve can produce great influence to the noise volume of sphygmomanometer in the link of disappointing, and this application blood pressure realizes reducing the noise of the disappointing state of sphygmomanometer through the noise that reduces the solenoid valve.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the arrangement of the first exhaust cavity and the second exhaust cavity enables the air in the inner hole to flow through two air paths, and the two air paths are defined as a first air path connected with the first exhaust cavity and a second air path connected with the second exhaust cavity. The gas in the gas storage part enters the inner hole through the gas passing cavity, one part of the gas is discharged from the first gas path, and the other part of the gas is discharged from the second gas path, so that the gas paths in the inner hole of the traditional single solenoid valve are changed into two paths from one path, and the flow of the gas in the single gas path in unit time is reduced, therefore, the solenoid valve can reduce the generation of noise by reducing the gas flow rate on each gas path;

2. the stable section of the reset elastic piece is sleeved on the positioning groove to reduce the contact area between the inner core and the inner wall of the inner hole during collision, so that the impact noise between the inner core and the inner hole is reduced, and the noise can be further reduced;

3. the connecting part is connected with the sealing part and the anti-falling part, the anti-falling part is matched with the connecting part to provide tensile force for the sealing part, so that the sealing part is limited to be separated from the sealing hole from one end, close to the air passing cavity, of the inner core, meanwhile, the sealing part is matched with the connecting part to provide tensile force for the anti-falling part, so that the anti-falling part is limited to be separated from the bottom wall of the mounting hole from one end, far away from the air passing cavity, of the inner core, and therefore the sealing element can be stably mounted on the inner core;

4. when the sealing element is installed, the separating part sequentially penetrates through the sealing hole, the connecting hole and the installing hole, so that the end part of the separating part penetrates out of one end, far away from the sealing hole, of the installing hole, at the moment, pulling force is applied to the separating part, the anti-falling part penetrates through the connecting hole and enters the installing hole, the sealing part is stably installed in the sealing hole, at the moment, pulling force is continuously applied to the separating part to break the connecting part between the separating part and the anti-falling part, and therefore separation between the separating part and the anti-falling part is completed, and therefore the sealing element is installed more conveniently.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic illustration of an explosive structure according to an embodiment of the present application;

FIG. 3 is a schematic cross-sectional structural view of an embodiment of the present application;

FIG. 4 is an enlarged partial schematic view of portion A of FIG. 1;

FIG. 5 is a schematic view of the present application showing the separation portion separated when the core is installed with the sealing member;

FIG. 6 is a schematic view of the present application showing the unseparated segment when the plunger is installed with the sealing element;

fig. 7 is a schematic structural diagram of a framework in an embodiment of the present application.

In the figure, 1, a housing; 11. a housing; 111. an end surface portion; 112. a side edge portion; 12. an end cap; 2. a framework; 21. an inner bore; 22. a first air passing gap; 23. a first exhaust cavity; 24. a second exhaust chamber; 241. a buffer section; 242. a flow guide part; 3. a coil; 4. an inner core; 41. sealing the hole; 42. connecting holes; 43. mounting holes; 44. positioning a groove; 5. a restoring elastic member; 6. a seal member; 61. a sealing part; 62. a connecting portion; 63. an anti-drop part; 64. a separation section; 65. easily breaking the groove; 7. a gas passing piece; 71. a gas passing cavity; 72. an air inlet end; 73. an air outlet end; 74. an exhaust diversion trench.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses a solenoid valve, mainly used sphygmomanometer etc. need carry out the equipment of the control of losing heart of gas pressurize to make the gas storage spare of equipment can switch over in pressurize state or state of losing heart.

Referring to fig. 1 and 2, the solenoid valve includes a housing 1, a gas passing member 7, a bobbin 2, a coil 3, an inner core 4, a return elastic member 5, and a sealing member 6.

The housing 1 includes a case 11 and an end cap 12 fixedly provided to the case 11 by caulking or the like. The shell 11 is substantially "U" shaped to have an end surface 111 and two parallel side edges 112, the end cap 12 is parallel to the end surface 111 of the shell 11, and the side edges of the end cap 12 are connected to the corresponding side edges 112 of the shell 11. The housing 11 and the end cap 12 enclose an installation space.

The gas passing piece 7 is used for being connected with the gas storage piece so that gas in the gas storage piece can flow into the electromagnetic valve. Specifically, the air passing member 7 is substantially tubular, an air passing cavity 71 for air to flow through is formed in the air passing member 7, and one end of the air passing member 7 in the axial direction is an air inlet end 72 and the other end is an air outlet end 73. The air passage 7 is inserted into an end surface 111 of the housing 11. The air inlet end 72 of the air passing member 7 extends out of the shell 1, and the air outlet end 73 of the air passing member 7 can extend into the installation space of the shell 1.

The frame 2 is located in the installation space of the housing 1, and the end cover 12 is pressed against the frame 2 to press the frame 2 onto the end surface 111 of the housing 11, so as to realize the fixed connection between the frame 2 and the end cover 12. The coil 3 is provided around the outer peripheral surface of the bobbin 2 facing the side edge 112 of the housing 11, and the axis of the coil 3 substantially coincides with the axis of the air-passing member 7.

Referring to fig. 3 and 4, an inner hole 21 communicating with the air passing cavity 71 is formed through the bobbin 2, and the axis of the inner hole 21 substantially coincides with the axis of the coil 3. The air outlet end 73 of the air passing part 7 is positioned in the inner hole 21, the reset elastic part 5, the sealing part 6 and the inner core 4 are all arranged in the inner hole 21, and the reset elastic part 5, the sealing part 6 and the inner core 4 are all positioned on one side, close to the end cover 12, of the air outlet end 73 of the air passing part 7. The sealing member 6 is mounted to the core 4 for interference sealing or disengagement from the outlet end 73 of the vent member 7. The return elastic element 5 is sleeved on the inner core 4 to provide thrust for the inner core 4 in a direction away from the air passing element 7.

Specifically, referring to fig. 5 and 6, the inner core 4 is provided with a sealing hole 41, a connection hole 42, and a mounting hole 43 in this order in a direction away from the air passing chamber 71, the hole diameter of the connection hole 42 being smaller than the hole diameter of the sealing hole 41 and smaller than the hole diameter of the mounting hole 43. The sealing member 6 is entirely made of a material having elasticity such as rubber or silicone rubber. The sealing member 6 comprises a sealing part 61, a connecting part 62, a retaining part 63 and a separating part 64 which are arranged in sequence, wherein a connecting part of the retaining part 63 and the separating part 64 is provided with an easy-to-break groove 65 in a surrounding mode.

In the present embodiment, the sealing portion 61 and the connecting portion 62 are both substantially cylindrical, and the retaining portion 63 is substantially spherical. The ball diameter of the retaining portion 63 is smaller than that of the sealing portion 61, the diameter of the connecting portion 62 is smaller than that of the retaining portion 63, and the diameter of the separating portion 64 is smaller than that of the connecting portion 62. The sealing part 61 is installed on the sealing hole 41, and the sealing part 61 is used for abutting against the opening of the sealing air passing cavity 71 to achieve the sealing effect. The connecting portion 62 is located in the connecting hole 42, and the connecting portion 62 is used for connecting the sealing portion 61 and the retaining portion 63. The retaining portion 63 is installed on the wall of the mounting hole 43 on the side close to the connecting hole 42, and the retaining portion 63 is used for providing a pulling force to the sealing member 6 to limit the sealing member 6 from being separated from the core 4. The separation portion 64 is used to increase the length of the entire seal member 6 to facilitate the installation of the seal member 6, and the separation portion 64 and the retaining portion 63 can be broken and separated by tension. After the sealing element 6 is mounted on the inner core 4, the separating part 64 is separated from the anti-falling part 63, and at this time, pulling force is continuously applied to the separating part to break the connection part between the separating part and the anti-falling part, so that the sliding of the inner core 4 in the electromagnetic valve is not affected by overlong sealing element 6.

Referring to fig. 4, a positioning groove 44 is circumferentially arranged on the outer peripheral surface of the inner core 4 near one end of the air cavity 71, and the length of the positioning groove 44 in the axial direction of the inner core 4 is greater than half of the length of the inner core 4 in the axial direction. Correspondingly, the elastic reset part 5 comprises a reset section and a stable section, wherein the reset section is mainly used for providing reset thrust for the inner core 4, the stable section is mainly used for reducing the collision of the inner core 4 with the inner wall of the inner hole 21, the reset section is positioned at one end, close to the air passing cavity 71, of the stable section, the stable section is sleeved on the positioning groove 44, one end, far away from the stable section, of the reset section is abutted against the air passing part 7, one end, far away from the reset section, of the stable section is connected to the inner core 4, and therefore the reset section is enabled to provide the inner core 4 with a direction.

The coil 3 is electrified to generate magnetic force, so that the inner core 4 slides towards the direction close to the air passing piece 7, and the elastic resetting piece 5 is compressed and deformed by the pressure of the inner core 4 until the sealing piece 6 abuts against and seals the air outlet end 73 of the air passing piece 7, so that the air outlet end 73 of the air passing piece 7 is sealed and closed to limit the circulation of air. When the coil 3 is powered off and the electromagnetic force disappears, the elastic deformation force of the elastic restoring element 5 drives the inner core 4 to slide reversely, so that the sealing element 6 is separated from the air outlet end 73 of the air passing element 7, and the air can flow into the inner hole 21.

It should be noted that, with continued reference to fig. 4, the framework 2 is provided with a first exhaust cavity 23 and a second exhaust cavity 24 for exhausting gas simultaneously, and the gas outlet end 73 of the gas passing element 7 is located between the first exhaust cavity 23 and the second exhaust cavity 24. The arrangement of the first exhaust cavity 23 and the second exhaust cavity 24 enables the air in the inner hole 21 to flow to have two air paths, the air in the air storage part enters the inner hole 21 through the air passing cavity 71, then part of the air passes through the first air passing gap 22 to be discharged from the first exhaust cavity 23 to the outside, and the other part of the air is discharged from the second exhaust cavity 24 to the outside.

Specifically, a first air passing gap 22 communicated with the first air exhausting cavity 23 is formed between the outer peripheral surface of the inner core 4 and the inner wall of the inner hole 21, and the first air exhausting cavity 23 is formed on one side, far away from the air passing cavity 71, of the inner core 4 in the inner hole 21. Correspondingly, a second air passing gap communicated with the second exhaust cavity 24 is formed between the air passing piece 7 and the inner wall of the inner hole 21, and the second exhaust cavity 24 is positioned on the opening end face of one end of the inner hole 21 far away from the first exhaust cavity 23.

Referring to fig. 7, the second exhaust chamber 24 includes a buffer portion 241 disposed around the inner hole 21 and a plurality of flow guide portions 242 communicated with the buffer portion 241, and the flow guide portions 242 are disposed at a side of the buffer portion 241 far from the inner hole 21 to communicate the buffer portion 241 with the outside.

Referring to fig. 4, in order to increase the gas flow rate of the second air passing gap, an end surface of the air outlet end 73 of the air passing member 7 is provided with an exhaust guide groove 74, the exhaust guide groove 74 is located in the framework 2, and the exhaust guide groove 74 is communicated with the second exhaust cavity 24. In the present embodiment, the exhaust guide grooves 74 may be obtained only by providing a flat surface on the outer circumferential surface of the air passing member 7.

The implementation principle of this application embodiment solenoid valve and have its sphygmomanometer does: the solenoid valve circular telegram produces magnetism so that sealing member 6 and the end 73 of giving vent to anger of air passing 7, and the gas in the air storage part enters into hole 21 through air passing chamber 71 this moment, and partly gaseous is discharged from first gas circuit to make the gas circuit in the traditional single solenoid valve hole 21 become two the tunnel by one way, through the reduction of the circulation of gas unit interval in the single gas circuit in order to realize the reduction of noise.

The embodiment of the application discloses a sphygmomanometer, including above-mentioned solenoid valve, the setting of solenoid valve is mainly connected with sphygmomanometer's air pocket for reduce the noise that the air pocket loses heart and produces.

The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component. Therefore, the method comprises the following steps: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The electromagnetic valve is characterized by comprising a shell (1), a framework (2) arranged in the shell (1) and a coil (3) arranged on the framework (2), wherein the shell (1) is provided with a through air cavity (71) for air circulation, an inner hole (21) communicated with the through air cavity (71) is formed in the framework (2), an inner core (4) which is pushed by the electromagnetic force of the coil (3) to open and close the opening of the through air cavity (71) and a reset elastic part (5) for driving the inner core (4) to reset are arranged in the inner hole (21), and a sealing part (6) which is used for being in sealing fit with the opening of the through air cavity (71) is arranged on the inner core (4); the reset elastic piece (5) comprises a reset section and a stable section, wherein the reset section is mainly used for providing reset thrust for the inner core (4), and the stable section is mainly used for reducing the collision of the inner core (4) to the inner wall of the inner hole (21);

a first air passing gap (22) is formed between the inner core (4) and the inner wall of the inner hole (21), a first air exhausting cavity (23) and a second air exhausting cavity (24) which are used for exhausting air simultaneously are arranged on the framework (2), the first air exhausting cavity (23) is formed in one side, away from the air passing cavity (71), of the inner core (4) in the inner hole (21), and the second air exhausting cavity (24) is located on the opening end face of one end, away from the first air exhausting cavity (23), of the inner hole (21);

the inner core (4) is sequentially provided with a sealing hole (41), a connecting hole (42) and a mounting hole (43) along the direction far away from the air passing cavity (71), the sealing element (6) comprises a sealing part (61) used for sealing the opening of the air passing cavity (71), an anti-falling part (63) used for limiting the sealing element (6) to be separated from the inner core (4) and a connecting part (62) used for connecting the sealing part (61) with the anti-falling part (63), the sealing part (61) is mounted in the sealing hole (41), the connecting part (62) is located in the connecting hole (42), and the anti-falling part (63) is mounted on the hole wall of the mounting hole (43) close to one side of the connecting hole (42);

the sealing element (6) further comprises a separation part (64) capable of breaking away from the retaining part (63) in a tensioned manner, and when the sealing element (6) is mounted on the inner core (4), the separation part (64) is separated from the retaining part (63).

2. A solenoid valve according to claim 1, characterised in that the second exhaust chamber (24) comprises a buffer portion (241) arranged around the inner bore (21) and a flow guide portion (242) communicating with the buffer portion (241), the flow guide portion (242) being located on the side of the buffer portion (241) remote from the inner bore (21).

3. The electromagnetic valve according to claim 1, characterized in that the housing (1) is provided with a gas passing member (7), the gas passing chamber (71) is formed in the gas passing member (7), the gas passing member (7) is provided with a gas inlet end (72) and a gas outlet end (73), the gas inlet end (72) is located outside the housing (1), the gas outlet end (73) is located in the inner hole (21) of the framework (2) and between the first gas exhaust chamber (23) and the second gas exhaust chamber (24), a second gas passing gap is formed between the gas passing member (7) and the inner wall of the inner hole (21), and the second gas passing gap is communicated with the second gas exhaust chamber (24).

4. A solenoid valve according to claim 3, characterized in that the end face of the air outlet end (73) of the air passing member (7) is provided with an exhaust guide groove (74), the exhaust guide groove (74) is located in the framework (2), and the exhaust guide groove (74) is communicated with the second exhaust cavity (24).

5. The electromagnetic valve according to claim 1, characterized in that a positioning groove (44) is circumferentially arranged on the outer edge surface of the inner core (4) near one end of the air passing cavity (71), the resetting section is located at one end of the stabilizing section near the air passing cavity (71), and the stabilizing section is sleeved on the positioning groove (44).

6. The electromagnetic valve according to claim 1, characterized in that a connecting part of the anti-drop part (63) and the separating part (64) is provided with a easy-to-break groove (65).

7. A sphygmomanometer comprising the electromagnetic valve according to any one of claims 1 to 6.